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RE: VQ P-38 - 11/18/2012 3:34 PM   
JL1


 

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From: Mason, MI, USA
Status: offline 		Fwiw, I flew mine with a pair of O.S. 46's. On grass the take off runs were a bit long but it flew just fine with them. You just had to be a bit patient on grass !

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RE: VQ P-38 - 11/18/2012 4:46 PM   
rlinus


 

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Status: offline 		According to the plans it looks like the top center fuse is held on by one screw. No way that will hold IMO. I'm confused.

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RE: VQ P-38 - 11/18/2012 6:33 PM   
SJN



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Status: offline 		Yea, that is not going to cut it

I have 6 up front in the wing to body fairing 3 each side) , and one in the rear as shown on the drawing.

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RE: VQ P-38 - 11/18/2012 6:42 PM   
kram



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Status: offline 		rlinus: My favorites were the .61 O.S. 2-strokes. Decent speed, reliable engines, get around 11 minutes at high throttle on the stock tanks so I can fly for at least 8 minutes.

It's the one in the video I linked to Post # 8.

They did require some very meticulous fine-tuning of the low end when I put Bisson mufflers and a cowl over them, but never had to change the needle after the first several flights.

Remember, you cannot afford a dead engine on your first several flights, or you'll just be another guy with a sad P-38 story and no P-38

TwinMan used to put .90-sized 2-strokes in his and says they flew fine. So if you've already got the .95's, go ahead and use them

Once you get used to flying a 38, your need for speed will become almost obsessive.

Yes, I have seen them fly with good .46's, just like it says on the box, but I would recommend hard surface runway or very close-cropped grass.

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RE: VQ P-38 - 11/18/2012 6:48 PM   
kram



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Status: offline 		SJN:

Yes, that's about what I did. You can see them if you look closely at this picture.

I put hard mounts in the wing surface for those screws, since the wood seemed very soft

The top of the center fuse really doesn't count for much except cosmesis. The plane could fly without it unless you put your radio in there.


mt

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RE: VQ P-38 - 11/19/2012 1:14 AM   
swede5



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From: Cedar Rapids, IA, USA
Status: offline 		Did someone say 90 inverted two strokes? Running?

Twinman may have been able to do so (which I have no doubt) but I cannot keep those same engines running to save my arse. Couple that with the fact that the starboard engine tried to shorten my social finger while I was adjusting the needle on the ground (not the engines fault as the grass was wet and I slipped forward) made my mind up to switch to gas (plus the fact that this the second time a ST has bit me).

The 15cc RCGF engines are of the same displacement and footprint as the ST-90s and fit nicely under the cowl without much in the line of modifications.

The changeover was completed today but the plane will need to be put up for a little bit as I have another repair project that needs my attention. A Texan ARF had one of it's mains fold up during the initial taxi tests.

Here's where things are at this time ......... (if the files load ...........)



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RE: VQ P-38 - 11/19/2012 1:18 AM   
rlinus


 

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Status: offline 		Kram,

Thanks for taking the time to answer my questions. It's people like you who take the time to explain things that make this hobby more enjoyable. I'll be building the 38 over the winter so maiden won't be until spring. I haven't gotten the retracts yet, saving for those now. As you know this isn't a cheap hobby. Stay tuned for more questions as the build progresses!

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RE: VQ P-38 - 11/19/2012 1:22 AM   
rlinus


 

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Status: offline 		Where did you get the silver one? Or did you already have it and just convert.

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RE: VQ P-38 - 11/19/2012 1:31 AM   
rlinus


 

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Status: offline 		What do you think about a pair of DLE 20's?

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RE: VQ P-38 - 11/19/2012 1:32 AM   
swede5



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Status: offline 		Already had it. Bought it from Twinman a couple of years ago. Zero flying time to date with the ST-90 problems.

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RE: VQ P-38 - 11/19/2012 1:36 AM   
swede5



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Status: offline 		I think that you'll have a tough time fitting those under the cowls. I would need to take a look at the dimensions of the two engines side by side but these stretch the concept.

I was lucky in that the ignition module fit inside the boom next to the fuel tank. And pitts mufflers are a must or even goodbye more cowl.

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RE: VQ P-38 - 11/19/2012 2:18 AM   
kram



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Status: offline 		rlinus:

You're quite welcome, and most kind.

Just remember that I try to express my opinions and observations succinctly, so as not to confuse anyone. That doesn't mean that they are gospel: they're still just my opinions.

swede5 can confirm that I have flown (and crashed) more P-38's than most people in the hobby, so I've acquired my opinions the old-fashioned way.


mt





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